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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
I do not recall, since it's been a while since I've posted this solution, but I think that I just used the method template provided by the kata and have not changed the signature of the method myself.
It could be, that the kata has changed slightly since then.
An exercise in obfuscation.